78583912865 has 8 divisors (see below), whose sum is σ = 94345001640. Its totient is φ = 62837592832.

The previous prime is 78583912837. The next prime is 78583912877. The reversal of 78583912865 is 56821938587.

It can be written as a sum of positive squares in 4 ways, for example, as 8254994449 + 70328918416 = 90857^2 + 265196^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78583912865 - 2¹⁰ = 78583911841 is a prime.

It is a super-2 number, since 2×78583912865² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78583912798 and 78583912807.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680474 + ... + 3701763.

It is an arithmetic number, because the mean of its divisors is an integer number (11793125205).

Almost surely, 2^78583912865 is an apocalyptic number.

It is an amenable number.

78583912865 is a deficient number, since it is larger than the sum of its proper divisors (15761088775).

78583912865 is a wasteful number, since it uses less digits than its factorization.

78583912865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7384371.

The product of its digits is 29030400, while the sum is 62.

The spelling of 78583912865 in words is "seventy-eight billion, five hundred eighty-three million, nine hundred twelve thousand, eight hundred sixty-five".